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- Homework Statement
- So I am supposed to find out if any of the vector fields given has zero curl or not.

- Relevant Equations
- So I know that curl has something to do with rotation, and I know how to calculate this vector, but not how to observe if it is zero or not from a picture of the vector field.

These are the vector fields. I really have no idea how to see if there is a curl or not. I have been looking at the rotation of the vector fields. The fields d and e seem to have some rotation or circular paths, but I read online that curl is not about the rotation of the vector field itself, but more about the rotation of points in the vector field. Can someone help me understand how to determine if there is a curl when one are given a picture of a vector field like the ones below?